The development of the NMJ (Neuromuscular Junction) is triggered by agrin, a signaling factor that is deposited by the nerve terminal at the site of contact with the muscle cell. Motor neuron-derived agrin induces many aspects of synaptic differentiation and is required for the postsynaptic localization of many synapse-specific basal lamina, transmembrane, and cytoplasmic proteins. In addition, agrin is sufficient to induce aggregation of these synaptic proteins in muscle cells in vitro, or at ectopic sites on muscle fibers i...
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